| 摘要 |
<p>1310715 Encapsulation process BAYER AG 3 April 1970 [5 April 1969] 15828/70 Heading B8C [Also in Division A5] Solids and liquids are coated or encapsulated by dispersing them in an aqueous solution of a polymer which contains carboxyl or carboxylate groups and dispersing the solution or dispersion thus formed in an aqueous solution of an aluminium salt whereby the polymer is caused to harden, giving generally spherical particles of hardened polymer in which are embedded the solid or liquid particles. The encapsulated material may be a solid, a liquid or a solution of a solid in a water-immiscible liquid. Specific examples relate to the encapsulation of polybutene oil, aspirin and prontosil S. The polymer may be carboxymethyl cellulose, an alginate or pectin or a synthetic polymer such as copolymers of maleic anhydride with ethylene, isobutylene, styrene or vinyl ethers which have been at least partly converted to the carboxyl or carboxylate form, homopolymers of acrylic and methacrylic acids and copolymers thereof.</p> |
